Build breaks if sizeof (INTVAL) != sizeof (opcode_t), inter::types discards --opcode

[gerdr]

While testing #704, jnthn ended up with long long as INTVAL type and long as opcode_t type. This, however, is not a working combination - the build failed at

.\miniparrot.exe -Iruntime/parrot/include -o frontend/parrot2/prt0.pbc frontend/parrot2/prt0.pir
PackFile_pack segment 'DIRECTORY' used size 2368 but reported 2664

This issue probably never turned up before as the configuration step inter::types discards the configuration option --opcode and changes it to either --intval if present or long.

The only way one could end up with different values before my refactor of auto::sizes was manually skipping configuration steps or entering interactive mode via --ask, which obviously is not something normally done.

It should be discussed whether differing types should be supported at all. If so, the codebase needs to be fixed. If not, the --opcode configuration option should be removed.

[leto]

Differing types should be supported, if reasonable. I think the issue is that the --opcode option is rarely used or tested, which needs to be fixed.